cant get it to work

I have done this before so i know it works, cant figure out what i am doing
wrong this time,
2000 server, 2 NICs, 1 gig, 1 10/100, internet access to the server and half
of the local network on the 10/100 card, 10 units on the gig card and a
seperate gig switch,

all units on 10/100 working fine, can access internet and a unix based
server using an IP address and port 23 with a terminal emulation program,

all units on gig can access server, server printers and all server drives,
can only access the internet through the server using a proxy, cannot access
the unix machine.

i have tried using the same ip scope on both and a differant on the GIG
side, no differance,

i have done this in the past with no problem, must be the CRS syndrome
sneaking up on me....

HELP!!!!!!!!